Liquid crystal display device

ABSTRACT

Disclosed is a liquid crystal display device of which overall size and weight can be minimized. The liquid crystal display device has a light generating unit for generating a light. A light guiding plate guides the light to a display unit for displaying an image. A reflection plate is disposed under the light guiding plate for reflecting the light to the light guiding plate. A receiving container receives the reflection plate, the light guiding plate and the light generating unit. At least one boss is formed on a bottom of the receiving container for preventing the light generating unit from being moved by guiding a position of the light generating unit. Accordingly, the number of the parts installed in the liquid crystal display device can be reduced, and the manufacturing cost can be decreased because the manufacturing process is simplified in comparison with the liquid crystal display device including a separate lamp cover.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a liquid crystal display device,and more particularly to a liquid crystal display device having a smallsize for portable mobile communication devices or game devices.

[0003] 2. Description of the Related Art

[0004] Information processing devices have been rapidly developed in atrend with various architectures, functions and faster informationprocessing speed. Information processed in these information processingdevices has an electrical signal format. In order to visually confirminformation processed in the information processing device, a displaydevice as an interface is necessary.

[0005] A liquid crystal display device, which is lighter and smallerthan a CRT type display device, has been developed. The liquid crystaldisplay device enables a full color display with a high resolution. As aresult, the liquid crystal display device is widely used for a monitorof a computer, a television receiver, and another display device.

[0006] When a voltage is applied to a liquid crystal cell, a moleculararrangement of the liquid crystal is changed to cause a change inoptical properties. As a result, visual properties are changed todisplay various images.

[0007] Liquid crystal display devices are divided into to a TN (TwistedNematic) type and an STN (Super-Twisted Nematic) type. The liquidcrystal devices are also divided according to the driving type into anactive matrix display type that uses a switching device, and a TN liquidcrystal and a passive matrix display type using an STN liquid crystal.

[0008] The active matrix display type is used in a TFT-LCD and drives anLCD by using a TFT as a switching device. The passive matrix displaytype does not use any transistor and does not need a complex circuit.

[0009] Further, liquid crystal display devices are divided into atransmissive liquid crystal display device using a backlight and areflective liquid crystal display device that uses an exterior lightsource according to a method for using a light source.

[0010] The transmissive liquid crystal display device which uses theback light as a light source has a heavy weight and a large volume bythe existence of the back light, but is widely used since itindependently displays an image without using an exterior light source.

[0011] In particular, a liquid crystal display device having a properlyreduced size for portability is demanded according to the rapiddevelopment of the communication devices. Thus, a display device isdesired which has light weight, thin thickness and small size as well ashigh display quality to be applied to the mobile communication devicesand to the game devices considering portability thereof.

SUMMARY OF THE INVENTION

[0012] The present invention solves the aforementioned problems byproviding a liquid crystal display device of which a total weight can beminimized.

[0013] Also, the invention provides a liquid crystal display device ofwhich an overall size can be reduced.

[0014] Further, the invention provides a liquid crystal display devicewhich is easily assembled with an external apparatus such as aninformation processing device.

[0015] The invention further provides a liquid crystal display devicecapable of minimizing loss of a light.

[0016] In one aspect of the invention, there is provided a liquidcrystal display device having a light generating unit for generating alight, a light guiding plate for guiding the light toward a display unitfor displaying an image, a reflecting plate disposed under the lightguiding plate for reflecting the light to the light guiding plate, and areceiving container for receiving the reflecting plate, the lightguiding plate and the light generating unit. At least one boss is formedon a bottom of the receiving container for preventing the lightgenerating unit from being moved by guiding a position of the lightgenerating unit.

[0017] The receiving container includes a first receiving containerhaving a side wall and a bottom where an opening is formed at apredetermined portion of the bottom for exposing a rear surface of thereflecting plate, and a second receiving container for preventing thereflecting plate, the light guiding plate and the light generating unitfrom being separated from the first receiving container. The secondreceiving container is combined with the first receiving container. Fourbosses may be respectively formed at corner portions of the bottom ofthe first receiving container and the four bosses are spaced from theside wall of the first receiving container by a predetermined interval.

[0018] Also, a reflecting portion is extended from an end of thereflecting plate by a predetermined length. The reflecting portion maybe bent to enclose an outer face of the light generating unit and may befurther extended to cover an upper portion of the light generating unit.

[0019] At least one first penetrating hole corresponding to the bossformed on the bottom of the first receiving container is formed at thereflecting plate, and the reflecting plate is guided to a receivingposition by means of a combination between the at least one boss and theat least one first penetrating hole.

[0020] The light generating unit includes a lamp having an integralbody, for example, of a laid U shape and the lamp is received betweenthe at least one boss and the side wall of the first receivingcontainer. The reflecting portion may have a first reflection portion, asecond reflection portion and a third reflection portion formed fromends of the reflecting plate corresponding to the lamp of the laid Ushape having first and second bending portions. An upper face of thefirst bending portion of the lamp is covered with an overlap of firstend portions of the first and second reflection portions adjacent to thefirst bending portion, and an upper face of a second bending portion ofthe lamp is covered with an overlap of second end portions of the secondand third reflection portions adjacent to the second bending portion. Atthat time, the first end portion of the first reflection portioncovering the first bending portion is extended longer than the first endportion of the second reflection portion, and the second end portion ofthe third reflection portion covering the second bending portion isextended longer than the second end portion of the second reflectionportion.

[0021] At least one opening corresponding to a shape of the lamp isformed in the bottom of the first receiving container to radiate a heatgenerated from the lamp.

[0022] Also, the liquid crystal display device further includesdiffusion sheets for enlarging a visual angle of the light emitted fromthe light guiding plate to provide the light to the display unit, andthe diffusion sheets are guided by a plurality of protuberances formedat an upper portion of a wall of the first receiving container.

[0023] Furthermore, the liquid crystal display device includes a topchassis combined with the first receiving container for fixing thedisplay unit received on the second receiving container to the secondreceiving container, and a printed circuit board combined with the rearsurface of the first receiving container for controlling operations ofthe light generating unit and the display unit. A combining portion isformed by being partially extended from a side wall of the top chassis,and the combining portion is combined with a ground terminal of theprinted circuit board.

[0024] The light generating unit includes a power supply line formed atboth ends thereof to receive a driving power from outside. An isolationwall is formed on the bottom of the first receiving container spacedfrom one side wall of the first receiving container, and the powersupply line is guided from the first and the second receiving containersto outside through a space between the isolation wall and the side wall.

[0025] In another aspect, there is provided a liquid crystal displaydevice having a display unit for displaying an image, a receivingcontainer for receiving the display unit, a power supplying unit forproviding a driving power to the display unit, and a printed circuitboard having an opening for receiving the power supplying unit. Thepower supplying unit is inserted and received in the opening of theprinted circuit board.

[0026] The power supplying unit may be a transformer for converting apower from outside into the driving power which is to be provided to thedisplay unit.

[0027] In further aspect, there is provided a liquid crystal displaydevice including a display unit for displaying an image, a receivingcontainer for receiving the display unit, a first printed circuit boardinstalled beneath a bottom of the receiving container wherein the firstprinted circuit board has a power supplying unit for providing a drivingpower to the display unit and a signal converting unit for converting asignal provided to the display unit, a first connector installed on asecond printed circuit board separated from the first printed circuitboard wherein the first connector is connected to the power supplyingunit through a power supplying line for providing a power inputted fromoutside to the power supplying unit, a second connector installed on athird printed circuit board separated from the first and second printedcircuit boards wherein the second connector is connected to the signalconverting unit through a data transmitting line for providing a datasignal inputted from outside to the signal converting unit, a front casecombined with the display unit, and a rear case combined with the frontcase to receive the display unit. First and second openings, forreceiving the second and third printed circuit boards, are respectivelyformed in the front and rear cases to expose the first and secondconnectors, and the first and second connectors respectively received inthe first and second openings are movable to be apart from each other.

[0028] A third opening is formed in the first printed circuit board toreceive the power supplying unit and the power supplying unit isinserted in the third opening by a predetermined depth. The powersupplying unit may be a transformer for converting a power from outsideinto the driving power which is to be provided to the display unit.

[0029] In still another aspect, there is provided a liquid crystaldisplay device including a light generating unit for generating a light,a light guiding plate for guiding the light to a display unit fordisplaying an image, a reflection plate installed under the lightguiding plate for reflecting the light to the light guiding plate, and areceiving container for receiving the reflection plate, the lightguiding plate and the light generating unit. An end of the reflectionplate is extended by a predetermined length to form a reflectingportion, and the reflecting portion may be bent to enclose an outside ofthe light generating unit and may be further extended to cover an upperface of the light generating unit.

[0030] According to the liquid crystal display device of the invention,the number of the parts installed in the liquid crystal display devicecan be reduced and the manufacturing cost can be decreased because themanufacturing process is simplified in comparison with the liquidcrystal display device adopting a separate lamp cover.

[0031] Also, the transformer supplying the driving power to the lamp andthe liquid crystal display panel is received in the opening formed inthe printed circuit board installed on the rear surface of the receivingcontainer by being inserted into a predetermined depth. Thus, the wholethickness of the liquid crystal device can be reduced as much as thedepth that the transformer is inserted into the opening.

BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and other objects and advantages of the presentinvention will become readily apparent by reference to the followingdetailed description with reference to the accompanying drawings inwhich:

[0033]FIG. 1 is an exploded perspective view for schematically showing aliquid crystal display device according to an exemplary embodiment ofthe present invention;

[0034]FIGS. 2 and 3 are a perspective view and a plan view forillustrating a lower mold frame shown in FIG. 1;

[0035]FIGS. 4 and 5 are a perspective view and a plan view forillustrating an upper mold frame shown in FIG. 1;

[0036]FIGS. 6 and 7 are a perspective view and a plan view forillustrating a top chassis shown in FIG. 1;

[0037]FIG. 8 is a perspective view for showing a reflection plate shownin FIG. 1;

[0038]FIG. 9 is a perspective view for showing a light guiding plateshown in FIG. 1;

[0039]FIG. 10 is a perspective view for showing a lamp shown in FIG. 1;

[0040]FIG. 11 is a perspective view for showing diffusion sheets shownin FIG. 1;

[0041]FIG. 12 is a perspective view for showing a display unit shown inFIG. 1;

[0042]FIG. 13 is a plan view for illustrating an assembled structure ofthe lower mold frame, the reflection plate and the lamp shown in FIG. 1;

[0043]FIGS. 14 and 15 are partially cut perspective views forillustrating the assembled structure of the lower mold frame, thereflection plate and the lamp shown in FIG. 13;

[0044]FIG. 16 is a side view taken in a direction of A for showing theliquid crystal display device shown in FIG. 13;

[0045]FIG. 17 is a partially cut perspective view for illustrating anassembled structure of the lower mold frame and a power supplying lineshown in FIG. 13;

[0046]FIG. 18 is a perspective view for showing an appearance of theassembled liquid crystal display device shown in FIG. 1;

[0047]FIG. 19 is a cross-sectional view taken along a line of B-B′ forillustrating an assembled structure of the liquid crystal display deviceshown in FIG. 18;

[0048]FIG. 20 is a cross-sectional view taken along a line of C-C′ forillustrating the assembled structure of the liquid crystal displaydevice shown in FIG. 18;

[0049]FIG. 21 is a plan view for showing a printed circuit board forcontrolling an operation of the liquid crystal display device shown inFIG. 18;

[0050]FIG. 22 is a perspective view for illustrating an assembledstructure of the liquid crystal display device shown in FIG. 18 and theprinted circuit board shown in FIG. 21;

[0051]FIG. 23 is a cross-sectional view for showing an installationstructure of a transformer shown in FIG. 22;

[0052]FIGS. 24 and 25 are perspective views for illustrating a powerterminal and a data terminal shown in FIG. 21;

[0053]FIGS. 26 and 27 are a perspective view and a plan view for showinga case in which the liquid crystal display device is combined with theprinted circuit board shown in FIG. 22;

[0054]FIG. 28 is a perspective view for illustrating a front supportingportion shown in FIG. 27 and a power source and a data terminalsassembled with the front supporting portion;

[0055]FIG. 29 is a plan view for showing operations of the power sourceand the data terminals assembled with the front supporting portion shownin FIG. 28;

[0056]FIG. 30 is a perspective view for illustrating an outerinformation processing device assembled with the liquid crystal displaydevice shown in FIG. 27; and

[0057]FIG. 31 is a schematic perspective view for illustrating anoperation state of the liquid crystal display device assembled with theouter information processing device shown in FIG. 30.

DETAILED DESCRIPTION OF THE INVENTION

[0058] Hereinafter, a liquid crystal display device according to theexemplary embodiment of the present invention will be described indetail with reference to the accompanying drawings.

[0059]FIG. 1 is an exploded perspective view for schematically showing aliquid crystal display device according to an exemplary embodiment ofthe present invention.

[0060] Referring to FIG. 1, the liquid crystal display device 1000includes a liquid crystal display module for displaying an image when animage signal is applied thereto and a case (not shown) having front andrear cases for receiving the liquid crystal display module.

[0061] The liquid crystal display module includes a display unit 200having a liquid crystal display panel for displaying the image and aback light assembly 900 for providing a light to the display unit 200.The display unit 200 is mounted on the back light assembly 900 and fixedthereon by means of a top chassis 100 combined with the back lightassembly 900.

[0062] The back light assembly 900 has a lamp 500 generating the light,a light guide plate 600 for guiding the light generated from the lamp500 to the display unit 200, a reflection plate 700 for reflecting thelight from the light guide plate 600, a plurality of diffusion sheets400 disposed on the light guide plate 600 for adjusting a visual angleof the light, a lower mold frame 800 for receiving the reflection plate700, the light guide plate 600, the lamp 500 and the diffusion sheets400, and an upper mold frame 300 which is combined with the lower moldframe 800 and fixes the reflection plate 700, the light guide plate 600,the lamp 500 and the diffusion sheets 400. In FIG. 1, first and seconddiffusion sheets 410 and 420 are shown, but of course it is understoodthat the number of the diffusion sheet is not limited to two (2).

[0063] Hereinafter, the display unit 200 and the back light assembly 900of the liquid crystal display device 1000 will be described in detailwith reference to the FIGS. 2 to 12.

[0064] FIGS. 1-3 are respectively a prospective view and a plan view forparticularly illustrating the lower mold frame 800 shown in FIG. 1.

[0065] Referring to FIGS. 2 and 3, the lower mold frame 800 has first,second, third and fourth walls 810, 812, 814 and 816 integrallyconnected one after another and first, second, third and fourth bottoms820, 822, 824 and 826 respectively extended from the first to fourthwalls 810, 812, 814 and 816. An opening having a predetermined shape isformed at a central portion of the lower mold frame 800 and the openingis defined by the first to fourth bottoms 820, 822, 824 and 826 andexposes a rear surface of the reflection plate 700.

[0066] First, second, third and fourth protuberances 832, 834, 836 and838 are respectively formed on the corners of the bottoms 820, 822, 824and 826 of the lower mold frame 800. The first to fourth protuberances832, 834, 836 and 838 are respectively spaced apart from the first tofourth walls 810, 812, 814 and 816 by a predetermined interval. Thefirst, second, third and fourth protuberances 832, 834, 836 and 838 fixthe lamp 500 and the light guide plate 600 in predetermined positionsand prevent the lamp 500 from being damaged due to the movement of thelight guide plate 600. Such functions of the protuberances 832, 834, 836and 838 will be described later.

[0067] Meanwhile, a plurality of openings 828 having predetermined sizesare formed on the first, second and third bottoms 820, 822 and 824. Thelamp 500 is disposed on the first, second and third bottoms 820, 822 and824 of the lower mold frame 800 while the reflection plate 700 isinterposed between the lamp 500 and the lower mold frame 800, and theheat generated from the lamp 500 can be easily radiated to an outside ofthe device through the openings 828. The openings 828 are only formed onthe first, second and third bottoms 820, 822 and 824 since the lamp 500of the liquid crystal display device 100 has the laid U shape. Thus,when the lamp 500 has a reversed L shape or a linear shape, the openings828 are formed only on the bottom on which the lamp 500 having thereversed L shape or the linear shape is disposed.

[0068] An isolation wall 840 that is spaced apart from the fourth wall816 by a predetermined interval is formed on the fourth bottom 826 wherethe openings are not formed so that a groove-shaped guide passage 846 isprovided between the fourth wall 816 and the isolation wall 840. A powersupplying line of the lamp 500 is guided by the guide passage 846 andextended toward the outside through a leader groove 850 formed bypartially opening a portion of the fourth wall 816.

[0069] As shown in FIG. 2, the leader groove 850 is formed at apredetermined portion of the fourth wall 816 such that the leader groove850 is adjacent to a the predetermined portion where a high voltage ofthe lamp 500 is applied. Also, fifth and sixth protuberances 842 and 844are formed on an upper end of the isolation wall 840 by a predeterminedinterval. The fifth and sixth protuberances 842 and 844 are inserted inengaging holes of the diffusion sheets 400 which are mounted on thelight guide plate 600, and guide the diffusion sheets 400 so that thediffusion sheets are placed at predetermined positions.

[0070] A plurality of protuberances are respectively formed on outersurfaces of the first to fourth walls 810, 812, 814 and 816 of the lowermold frame 800. First and second engaging protuberances 861 and 863 areformed on the first wall 810, and third and fourth engagingprotuberances 865 and 867 are formed on the fourth wall 816 facing thefirst wall 810. Also, a fifth engaging protuberance 869 is formed on thesecond wall 812. The first to fifth engaging protuberances 861, 863,865, 867 and 869 are respectively engaged with engaging holes of theupper mold frame 300 so that the first to fifth engaging protuberances861, 863, 865, 867 and 869 prevent the reflection plate 700, the lightguiding plate 600, the lamp 500 and the diffusion sheets 400 from beingmoved.

[0071] In addition, first and second fixing protuberances 871 a and 872a are formed on the first wall 810 and third and fourth fixingprotuberances 873 a and 874 a are formed on the fourth wall 816. Fifthand sixth fixing protuberances 875 a and 876 a are formed on the secondwall 812 and seventh and eighth fixing protuberances 878 and 879 areformed on the third wall 814 that faces the second wall 812. The firstto eighth fixing protuberances 871 a, 872 a, 873 a, 874 a, 875 a, 876 a,878 and 879 are respectively combined with fixing holes formed on thetop chassis 100 to fix the display unit 200 mounted on the upper moldframe 300 to a predetermined position.

[0072] The first to sixth fixing protuberances 871 a, 872 a, 873 a, 874a, 875 a and 876 a are respectively formed on first, second, third,fourth, fifth and sixth embossings 871, 872, 873, 874, 875 and 876 whichare respectively protruded from the first, second and fourth walls 810,812 and 816. Therefore, the first to sixth fixing protuberances 871 a,872 a, 873 a, 874 a, 875 a and 876 a are extended further than the firstto fifth engaging protuberances 861, 863, 865, 867 and 869. As a result,the first to sixth fixing protuberances 871 a, 872 a, 873 a, 874 a, 875a and 876 a can be easily combined with the fixing holes formed on thetop chassis 100.

[0073]FIGS. 4 and 5 are respectively perspective and plan views forillustrating the upper mold frame 300 shown in FIG. 1.

[0074] Referring to FIGS. 1-5, a bottom 320 of the upper mold frame 300is opened to have a size wider than an effective display area of thedisplay unit 200. The bottom 320 has a border portion 310 and side wallsare extended from ends of the border portion 310 to receive the displayunit 200. A side wall at one end of the border portion 310 of the bottom320 is opened so that a printed circuit board of the display unit 200 isbent toward one wall of the upper mold frame 300, and is easily guidedto the rear surface of the lower mold frame 800.

[0075] First and second engaging holes 331 and 333 are formed throughthe wall of the upper mold frame 300 corresponding to the first wall 810of the lower mold frame 800. The first and second engaging holes 331 and333 are respectively engaged with the first and second engagingprotuberances 861 and 863. Third and fourth engaging holes 335 and 337are formed through the wall of the upper mold frame 300 corresponding tothe fourth wall 816 of the lower mold frame 800. The third and fourthengaging holes 335 and 337 are respectively engaged with the third andfourth engaging protuberances 865 and 867. Also, a fifth engaging hole339 is formed through the wall of the upper mold frame 300 correspondingto the second wall 812 of the lower mold frame 800. The fifth engaginggroove 339 is engaged with the fifth engaging protuberance 869.

[0076] As described above, the upper mold frame 300 is combined with thelower mold frame 800 by engaging the first to fifth engagingprotuberances 861, 863, 865, 867 and 869 of the lower mold frame 800with the first to fifth engaging holes 331, 333, 335, 337 and 339 of theupper mold frame 300, respectively.

[0077] In addition, first and second guide grooves 340 and 341 areformed on the wall of the upper mold frame 300 corresponding to thefirst wall 810 of the lower mold frame 800 by partially removing thewall of the upper mold frame 300 to expose the first and secondembossings 871 and 872. Third and fourth guide grooves 343 and 345 areformed on the wall of the upper mold frame 300 corresponding to thefourth wall 816 of the lower mold frame 800 by partially removing thewall of the upper mold frame 300 to expose the third and fourthembossings 873 and 874. Also, fifth and sixth guide grooves 347 and 349are formed on the wall of the upper mold frame 300 corresponding to thesecond wall 812 of the lower mold frame 800 by partially removing thewall of the upper mold frame 300 to expose the fifth and sixthembossings 875 and 876. Hence, the first to eighth fixing protuberances871 a, 872 a, 873 a, 874 a, 875 a, 876 a, 878 and 879 for fixing the topchassis 100 are sufficiently exposed from the upper mold frame 300.

[0078]FIGS. 6 and 7 are respectively perspective and plan views forparticularly illustrating the top chassis 100 shown in FIG. 1.

[0079] Referring to FIGS. 1-7, the bottom 110 of the top chassis 100 ispartially opened to expose the effective display area of the displayunit 200 and the top chassis 100 includes walls respectivelycorresponding to the first to fourth walls 810, 812, 814 and 816 of thelower mold frame 800. The top chassis 100 is combined with the lowermold frame 800 to fix the display unit 200 on the upper mold frame 300.For this purpose, first and second fixing holes 121 and 122 are formedthrough the wall of the top chassis 100 corresponding to the first wall810 of the lower mold frame 800, and the first and second fixing holes121 and 122 are respectively engaged with the first and second fixingprotuberances 871 a and 872 a. Third and fourth fixing holes 123 and 124are formed through the wall of the top chassis 100 corresponding to thefourth wall 816 of the lower mold frame 800, and the third and fourthfixing holes 123 and 124 are respectively engaged with the third andfourth fixing protuberances 873 a and 874 a.

[0080] Also, fifth and sixth fixing holes 125 and 126 are formed throughthe wall of the top chassis 100 corresponding to the second wall 812 ofthe lower mold frame 800, and the fifth and sixth fixing holes 125 and126 are respectively engaged with the fifth and sixth fixingprotuberances 875 a and 876 a. Seventh and eighth fixing holes 127 and128 are formed through the wall of the top chassis 100 corresponding tothe third wall 814 of the lower mold frame 800, and the seventh andeighth fixing holes 127 and 128 are respectively engaged with theseventh and eighth fixing protuberances 878 and 879.

[0081] As described above, when the first to eighth fixing protuberances871 a, 872 a, 873 a, 874 a, 875 a, 876 a, 878 and 879 of the lower moldframe 800 are correspondently engaged with the first to eighth fixingholes 121, 122, 123, 124, 125, 126, 127 and 128 of the top chassis 100,the movement and the separation of the display unit 200 on the uppermold frame 300 can be prevented. In addition, a flexible printed circuitboard of the display unit 200 is bent by means of the wall of the topchassis 100 correspondingly combined with the third wall 814 of thelower mold frame 800.

[0082] Portions of the walls of the top chassis 100 respectivelycorresponding to the first and fourth walls 810 and 816 of the lowermold frame 800, are perpendicularly protruded to form first to fourthfixing pieces 132, 134, 136 and 138.

[0083] The liquid crystal display device 1000 assembled asabove-described is installed in a printed circuit board (not shown)having an inverter circuit and an A/D circuit for supplying a power todrive the display unit 200 and the back light assembly 900. The first tofourth fixing pieces 132, 134, 136 and 138 are combined with fixingholes formed on the printed circuit board, for example, by screws,combining the liquid crystal device 100 and the printed circuit board(not shown). Also, the first to fourth fixing pieces 132, 134, 136 and138 function as ground pieces for grounding the top chassis 100 whilecombining with the fixing grooves of the printed circuit board (notshown). Such function of the fixing pieces 132, 134, 136 and 138 will bedescribed later.

[0084] Hereinafter, structures will be described of the reflection plate700, the light guide plate 600, the lamp 500 and the diffusion sheets400 received between the upper mold frame 300 and the lower mold frame800, as well as the structure of the display unit 200 received betweenthe upper mold frame 300 and the top chassis 100.

[0085]FIG. 8 is a perspective view for showing the reflection plateshown in FIG. 1, FIG. 9 is a perspective view for illustrating the lightguiding plate shown in FIG. 1, FIG. 10 is a perspective view for showingthe lamp shown in FIG. 1, FIG. 11 is a perspective view for illustratingthe diffusion sheets shown in FIG. 1, and FIG. 12 is a perspective viewfor showing the display unit shown in FIG. 1.

[0086] Referring to the figures and particularly to FIG. 8, thereflection plate 700 has a reflection bottom 710 for reflecting thelight from the light guide plate 600 toward the display unit 200, andfirst, second and third reflection walls 720, 730 and 740 for reflectingthe light generated form the lamp 500 toward the light guide plate 600.

[0087] The first, second and third reflection walls 720, 730 and 740 arerespectively extended from the ends corresponding to the first to thirdwalls 810, 812 and 814 of the lower mold frame 800. Particularly, thefirst to third reflection walls 720, 730 and 740 include first, secondand third reflection side walls 722, 732 and 742 enclosing an outside ofthe lamp 500, and first, second and third reflection covers 724, 734 and744 for covering the lamp 500. The first to third reflection side walls722, 732 and 742 are perpendicular to the reflection bottom 710. Thefirst to third reflection covers 724, 734 and 744 are bent from thefirst to third reflection side walls 722, 732 and 742 parallel with thereflection bottom 710. The second and third reflection covers 734 and744 have first and second wings 736 and 746 protruded therefrom at anend portion adjacent to the first reflection wall 720.

[0088] First and second insertion holes 752 and 754 and first and secondinsertion grooves 756 and 758 are formed at four corners of thereflection bottom 710, and the first and second insertion holes andgrooves 752, 754, 756 and 758 respectively correspond to the first tofourth protuberances 832, 834, 836 and 838 formed at the four corners ofthe bottom of the lower mold frame 800.

[0089] Referring to FIG. 9, the lamp 500 has the laid U shape havingfirst and second bending portions 512 and 514. A first power supplyingline 532 for applying a high voltage to the lamp 500 is electricallyconnected to one end of the lamp 500 and a second power supplying line534 for applying a low voltage to the lamp 500 is electrically connectedto the other end of the lamp 500. First and second lamp holders 522 and524 are respectively combined with opposite ends of the lamp 500 tomaintain the connection state between the lamp 500 and a power supplyingline 530 including the first power supplying line 532 and the secondpower supplying line 534. The method for mounting the lamp 500 on thelower mold frame 800 will be described later.

[0090] Referring to the figures, particularly to FIG. 10, the lightguide plate 600 has a shape of a rectangular plate corresponding to thedisplay unit 200 and ends of the light guide plate 600 have a samethickness to form an edge type. Printed patterns (not shown) are formedon the light guide plate 600 for increasing the reflection efficiency ofthe light emitted from the lamp 500, and an interval between twoadjacent printed patterns gets smaller as the printed patterns arespaced more apart from the lamp 500.

[0091] Four corners of the light guide plate 600 are partially cut toprevent the light guide plate 600 from being moved when the light guideplate 600 is mounted on the lower mold frame 800, thereby forming first,second, third and fourth clamping jaws 612, 614, 616 and 618.

[0092] Referring to FIG. 11, the diffusion sheets 400 include a firstdiffusion sheet 410 and a second diffusion sheet (not shown)respectively having different visual angle directions with respect tothe light. That is, the first diffusion sheet 410 diffuses the lightemitted from the light guide plate 600 in the x-axis direction when thesecond diffusion sheet (not shown) diffuses the light emitted from thelight guide plate 600 in the y-axis direction, so the visual angle ofthe image displayed through the display unit 200 can be enlarged as awhole.

[0093] The first diffusion sheet 410 has a shape identical to that ofthe second diffusion sheet 420. In particular, ends of the first and thesecond diffusion sheets 410 and 420 are respectively extended to formfirst and second protruding portions 412 and 414. Seventh and eighthengaging holes 412 a and 414 a engaged with the fifth and sixthprotuberances 842 and 844 formed on the isolation wall 840 of the lowermold frame 800 are respectively formed in the first and secondprotruding portions 412 and 414.

[0094] Referring to FIG. 12, the display unit 200 for displaying theimage corresponding to the light which is generated from the lamp 500and passed through the light guide plate 600 and the diffusion sheets400, is provided on the upper mold frame 300 that is disposed on thediffusion sheets 400.

[0095] The display unit 200 includes a liquid crystal display panel 210,a gate driver integrated circuit (IC) 220, a data driver integratedcircuit (IC) 230, and a flexible printed circuit board 240 on whichwiring patterns are formed for transmitting gate and data drivingsignals to the gate driver IC 220 and the data driver ICs 230 providedfrom a gate-and-data printed circuit board (not shown). The gate driverIC 220 is formed at one portion of the liquid crystal display panel 210and the data driver integrated circuits 230 are formed at the otherportion of the liquid crystal display panel 210. A signal transmittingline for transmitting the gate driving signal to the gate driver IC 220is extended to the flexible printed circuit board 240 through aninactive region of the liquid crystal display panel 210. That is, thepatterns of the signal transmitting line of the gate driver IC 220 anddata driver ICs 230 are integrally formed on the flexible printedcircuit board 240, and a connection terminal 250 is formed at the end ofthe flexible printed circuit board 240. The connection terminal 250 iselectrically connected to the gate-and-data printed circuit boards ofthe printed circuit board (not shown) which is combined with the rearsurface of the liquid crystal display device 1000.

[0096] The liquid crystal display panel 210 has a thin film transistorsubstrate 214, a color filter substrate 212 and a liquid crystal (notshown).

[0097] The thin film transistor substrate 214 includes a transparentglass substrate on which thin film transistors in a matrix shape areformed. A data line is connected to source terminals of the thin filmtransistors and a gate line is connected to the gate terminals of thethin film transistors. Also, a pixel electrode is connected to each ofthe drain terminals of the thin film transistors and the pixel electrodeis generally formed of a transparent conductive material such as IndiumTin Oxide (ITO).

[0098] When electric signals are applied to the data and the gate lines,the electrical signals are transmitted to the source and the gateterminals of the thin film transistors, turning on or off the thin filmtransistors and outputting electrical signals for the formation of thepixel through the drain terminals of the thin film transistors.

[0099] The color filter substrate 212 is provided to face the thin filmtransistor substrate 214. RGB pixels are formed on the color filtersubstrate 212, for example, via a thin film processing, and give apredetermined color while the light passes through the color filtersubstrate 212. Common electrodes made of the ITO are coated on a frontsurface of the color filter substrate 212.

[0100] When the thin film transistors are turned on by applying a powersource to the gate terminals and the source terminals of the thin filmtransistors of the thin film transistor substrate 214, an electric fieldis generated between the pixel electrodes and the common electrodes ofthe color filter substrate 212. The alignment angle of the liquidcrystal injected between the thin film transistor substrate 214 and thecolor filter substrate 212 is changed according to the electric field,and then the light transmissivity is changed to obtain a desired pixelin accordance with the changed alignment angle of the liquid crystal.

[0101] To control the alignment angle and the alignment timing of theliquid crystal of the liquid crystal display panel 210, driving andtiming signals applied to the gate and the data lines of the thin filmtransistor are provided from the gate-and-data printed circuit board(not shown) through the signal transmitting lines of the gate driver IC220 and the data driver ICs 230. Namely, the gate-and-data printedcircuit board (not shown) generates the gate driving and the datasignals for driving the liquid crystal display 1000 and a plurality oftiming signals for properly applying the gate driving and the datasignals, and then the gate driving signal is applied to the gate line ofthe liquid crystal panel 210 through the gate driver IC 220 and the datasignal is applied to the data line of the liquid crystal panel 210through the data driver ICs 230.

[0102] Hereinafter, the assembled structure of the above-describedliquid crystal display device will be described with reference to FIGS.13 to 19.

[0103]FIG. 13 is a plan view for showing the assembled structure inwhich the reflection plate and the lamp are assembled with the lowermold frame shown in FIG. 1 and FIGS. 14 and 15 are partially cutperspective views for illustrating the assembled structure of the uppermold frame, the reflection plate and the lamp shown in FIG. 13.

[0104] As shown in FIG. 13, the first to fourth protuberances 832, 834,836 and 838 formed on the first to fourth bottoms 820, 822, 824 and 826of the lower mold frame 800 respectively correspond to the first andsecond insertion holes and grooves 752, 754, 756 and 758 formed on thereflection bottom 710 of the reflection plate 700, thereby combining thereflection plate 700 with the lower mold frame 800.

[0105] The first to fourth protuberances 832, 834, 836 and 838respectively penetrating the first and second insertion holes andgrooves 752, 754, 756 and 758 prevent the reflection plate 700 receivedon the lower mold frame 800 from being moved. The first to thirdreflection walls 720, 730 and 740 of the reflection plate 700 are bentcorresponding to the first to third side walls 810, 812 and 814 of thelower mold frame 800 in a direction perpendicular to the bottom of thelower mold frame 800.

[0106] The lamp 500 having the laid U shape is received in the lowermold frame 800 along the first to third side walls 810, 812 and 814 ofthe lower mold frame 800, after the reflection plate 700 is received inthe lower mold frame 800. Particularly, the first bending portion 512 ofthe lamp 500 having the laid U shape is placed between the firstprotuberance 832 of the lower mold frame 800 and the first side wall 810and the second side wall 812, and the second bending portion 514 of thelamp 500 having the laid U shape is placed between the secondprotuberance 834 of the lower mold frame 800, and the first side wall810 and the third side wall 814. Also, the first lamp holder 522 of thelamp 500 is placed between the third protuberance 836 of the lower moldframe 800, and the second side wall 812 and the fourth side wall 816,and the second lamp holder 524 of the lamp 500 is placed between thefourth protuberance 838 of the lower mold frame 800, and the third sidewall 814 and the fourth side wall 816.

[0107] As described above, when the lamp 500 is received in the lowermold frame 800, the position of the received lamp 500 generallycorresponds to the openings 828 formed in the bottom of the lower moldframe 800. That is, the lamp 500 is mounted at the positioncorresponding to the openings 828 for radiating the heat generated fromthe lamp 500.

[0108] As shown in FIGS. 14 and 15, the first and second wings 736 and746 formed on the second and third reflection covers 734 and 744 fullycover the first and second protuberances 832 and 834 when the first tothird reflection covers 724, 734 and 744 are bent to cover the uppersurface of lamp 500. Although not shown in FIGS. 14 and 15, the firstand second clamping jaws 612 and 614 of the light guide plate 600 shownin FIG. 10 are covered by the first and second wings 736 and 746.

[0109] If the first and second wings 736 and 746 are not formed, thefirst and second protuberances 832 and 834, and the first and secondclamping jaws 612 and 614 are not completely covered by the first tothird reflection covers 724, 734 and 744, so the light generated fromthe lamp 500 may be leaked.

[0110] Alternatively, both ends of the first reflection cover 724 areextended in the same manner as in the first and the second wings 736 and746. The extended ends of the first reflection cover 724 may replace thefirst and second wings 736 and 746 of the second and the thirdreflection covers 734 and 744 covering the first and secondprotuberances 832 and 834 and the first and the second clamping jaws 612and 614 of the light guide plate 600.

[0111]FIG. 16 is a side view for showing the liquid crystal displaydevice shown in FIG. 13 along the direction of A and FIG. 17 ispartially cut perspective view for illustrating the assembled structureof the lower mold frame and the power supplying line shown in FIG. 13.

[0112] The first and second power supplying lines 532 and 534 areelectrically connected to opposite ends of the lamp 500 as shown in FIG.9. The first power supplying line 532 provides the high voltage to oneend of the lamp 500 and the second power supplying line 534 maintainsthe other end of the lamp 500 as a ground level.

[0113] The first and second power supplying lines 532 and 534 are guidedto the leader groove 850 through the guide passage 846 formed by theisolation wall 840 and the fourth side wall 816 of the lower mold frame800 as shown in FIG. 17. In addition, the first and second powersupplying lines 532 and 534 are inserted in the leader groove 850 to beextended toward outside. If the leader groove 850 is adjacently formedto a central portion of the fourth side wall 816 or the fourthprotuberance 838, the first power supplying line 532 for applying thehigh voltage from outside to the lamp 500 may be equal to or longer thanthe second power supplying line 534. So, it is preferable that theleader groove 850 is adjacently formed to the third protuberance 836 onthe fourth side wall 816 as shown in FIG. 2.

[0114] In a case where the first power supplying line 532 for applyingthe high voltage to the lamp 500 is longer than the second powersupplying line 534, circuit parts of the liquid crystal display device1000 adjacent to the first power supplying line 532 may be mis-operatedby the heat generated due to the high voltage provided through the firstpower supplying line 532. Therefore, as shown in FIGS. 2, 16 and 17, thesecond power supplying line 534 maintained as the ground level is longerthan the first power supplying line 532, and the leader groove 850 isformed adjacent to the third protuberance 836 on the fourth side wall816.

[0115] The assembly process and the assembled structure of the liquidcrystal display device shown in FIG. 1 will be described with referenceto FIGS. 18 to 20.

[0116]FIG. 18 is a perspective view for showing an appearance of theassembled liquid crystal display device shown in FIG. 1 after the liquidcrystal display device is assembled, FIG. 19 is a cross-sectional viewtaken along B-B′ for illustrating the assembled structure of the liquidcrystal display device shown in FIG. 18, and FIG. 20 is across-sectional view taken along C-C′ for illustrating the assembledstructure of the liquid crystal display device shown in FIG. 18.

[0117] After the reflection plate 700, the lamp 500, the light guideplate 600 and the diffusion sheets 400 are successively received in thelower mold frame 800 shown in FIG. 13, the upper mold frame 300 iscombined with the lower mold frame 800. Subsequently, the display unit200 is mounted on the upper mold frame 300 and the top chassis 100 iscombined with the lower mold frame 800, thereby completing the liquidcrystal display device shown in FIG. 18.

[0118] Hereinafter, the assembly process and the assembled structure ofthe liquid crystal display device shown in FIG. 18 will be describedwith reference to FIGS. 19 and 20.

[0119] After the reflection plate 700 and the lamp 500 are received inthe lower mold frame 800, the light guide plate 600 is mounted on thereflection bottom 710 of the reflection plate 700 so that the first tofourth clamping jaws 612, 614, 616 and 618 are respectively coupled withthe first to fourth protuberances 832, 834, 836 and 838. The first tofourth protuberances 832, 834, 836 and 838 prevent the lamp 500 and thelight guide plate 600 from being moved and the lamp 500 from beingdamaged due to the movement of the light guide plate 600.

[0120] Then, the diffusion sheets 400 are placed on the light guideplate 600. The diffusion sheets 400 are guided to a proper position byinserting the fifth and sixth protuberances 842 and 844 of the isolationwall 840 into the seventh and eighth engaging holes 412 a and 414 arespectively formed on the first and second protruding portions 412 and414 as described above. The first and second power supplying lines 532and 534 of the lamp 500 are already extended to outside through theguide passage 846 and the leader groove 850.

[0121] Also, the fifth and sixth protuberances 842 and 844 of theisolation wall 840 are formed to be protruded from the guide passage 846to prevent the first and second power supplying lines 532 and 534received in the guide passage 846 from separating from the guidedpassage 846. Alternatively, for pressing the first and second powersupplying lines 532 and 534, protruding portions can be formed atpredetermined portions of the isolation wall 840, thereby preventing thefirst and second power supplying lines 532 and 534 from being separatedfrom the isolation wall 840.

[0122] As shown in FIGS. 19 and 20, the first to third reflection covers724, 734 and 744 are bent to cover the upper surface of the lamp 500.The upper mold frame 300 is fixedly combined with the lower mold frame800 by respectively engaging the first to fifth engaging holes 331, 333,335, 337 and 339 formed on the side wall of the upper mold frame 300with the first to fifth engaging protuberances 861, 863, 865, 867 and869. Also, the reflection plate 700, the light guide plate 600, the lamp500 and the diffusion sheets 400 can be stably maintained between theupper mold frame 300 and the lower mold frame 800. The bottoms of thediffusion sheets 400 are exposed by the opened bottom of the upper moldframe 300.

[0123] Subsequently, after the display unit 200 is mounted on the uppermold frame 300, the top chassis 100 is combined with the lower moldframe 800 so that the top chassis 100 pressurizes a predeterminedportion of end portions of the display unit 200.

[0124] The top chassis 100 is fixedly combined with the lower mold frame800 by respectively combining the first to eighth fixing holes 121, 122,123, 124, 125, 126, 127 and 128 formed through the side wall of the topchassis 100 with the first to eighth fixing protuberances 871 a, 872 a,873 a, 874 a, 875 a, 876 a, 878 and 879 formed on the lower mold frame800.

[0125] The above-mentioned liquid crystal display device 1000 requires adriving power and an image data signal for performing its own function.

[0126] It will be described that the printed circuit board having aninverter circuit for providing the driving power and a data convertingcircuit (A/D circuit) for providing the image data signal and a case forreceiving the liquid crystal display device with reference to FIGS. 21and 22.

[0127]FIG. 21 is a plan view for showing the printed circuit board forcontrolling the operation of the liquid crystal display device shown inFIG. 18, and FIG. 22 is a perspective view for illustrating the liquidcrystal display device shown in FIG. 18 assembled with the printedcircuit board shown in FIG. 21.

[0128] Referring to FIGS. 21 and 22, first, second, third and fourthground patterns 132 a, 134 a, 136 a and 138 a are formed on the printedcircuit board 1100 corresponding to the first, second, third and fourthfixing pieces 132, 134, 136 and 138 of the top chassis 100.

[0129] Also, the printed circuit board 1100 is partially removed so thatblind holes corresponding to penetrating holes formed through the firstto fourth fixing pieces 132, 134, 136 and 138 are formed in the first tofourth ground patterns 132 a, 134 a, 136 a and 138 a.

[0130] The upper and the lower portions of the printed circuit board1100 are cut to form first and second receiving portions 1110 and 1120on upper face and lower faces of the printed circuit board 1100.

[0131] A transformer 1130 of the inverter circuit is received in thefirst receiving portion 1110 and the transformer 1130 of the invertercircuit provides a predetermined voltage level to the lamp 500 and thedisplay unit 200 after it receives the driving voltage for the liquidcrystal display device from outside and converts the driving voltage tothe predetermined voltage level. For this purpose, a power terminal 1150is electrically connected to the lower portion of the printed circuitboard 1100 for providing the driving voltage from outside to thetransformer 1130.

[0132] When the liquid crystal display device 1000 is combined with theprinted circuit board 1100, the flexible printed circuit board 240 ofthe display unit 200, which is bent toward a rear side of the lower moldframe 800, is guided to the lower face of the printed circuit board 1100through the second receiving portion 1120 according to the combinationof the top chassis 100 and the lower mold frame 800.

[0133] The connection terminal 250 of the flexible printed circuit board240 is connected to a connector (not shown) disposed on the lower faceof the printed circuit board 1100 for providing the image data signaland the driving power for the display unit 200. To achieve thisperformance, a data terminal 1160 is connected to the lower portion ofthe printed circuit board 1100. The data terminal 1160 receives theimage data signal from outside, and then provides the image data signalto the printed circuit board 1100. In addition, an A/D circuit 1140 isinstalled on a predetermined portion of the printed circuit board 1100.The A/D circuit 1140 converts the image data signal having an analoguetype inputted through the data terminal 1160 into a digital image datasignal, and then provides the digital image signal to the connectorconnected to the connection terminal 250.

[0134] As shown in FIG. 22, the liquid crystal display device 1000 isfixed on the printed circuit board 1100 by first, second, third andfourth screws 132 b, 134 b, 136 b and 138 b which are inserted into thepenetrating holes of the first to fourth fixing pieces 132, 134, 136 and138 and are engaged with the blind holes of the first to fourth groundpatterns 132 a, 134 a, 136 a and 138 a.

[0135]FIG. 23 is a cross-sectional view for illustrating the transformershown in FIG. 22 which is installed in the printed circuit board.

[0136] To install the transformer 1130 of the inverter circuit, thefirst receiving portion 1110 having a predetermined size is formedthrough the printed circuit board 1100. The transformer 1130 is receivedinto the first receiving portion 1110, thereby minimizing the thicknessof the printed circuit board 1100. That is, the overall thickness of theprinted circuit board 1100 on which various circuit parts are installedincreases as the thickness “t2” of the transformer 1130 is added to thethickness of “t1” of the printed circuit board 1100 when the transformer1130 is installed on the printed circuit board 1100. However, when thetransformer 1130 is received in the first receiving portion 1110 afteran opening is formed in the printed circuit board 1100 as the firstreceiving portion 1110, the overall thickness of the printed circuitboard 1100 having the transformer 1130 thereon is reduced as much as thethickness of “t1”. Thus, the height of the transformer 1130 received inthe first receiving portion 1110 is lower than that of the liquidcrystal display device 1000 installed on the printed circuit board 1100,thereby reducing the overall thickness of the printed circuit board1100.

[0137] The power terminal 1150 and data terminal 1160 are installed ondifferent printed circuit boards as shown in FIG. 21.

[0138]FIGS. 24 and 25 are perspective views for showing the structuresof the power and the data terminals shown in FIG. 21.

[0139] Referring to FIG. 24, the power terminal 1150 includes a firstprinted circuit board 1151 which is electrically connected to theprinted circuit board 1100 through a first signal transmitting line1152, and a first connector 1153 having a first neck 1155 installed onthe first printed circuit board 1151.

[0140] Referring to FIG. 25, the data terminal 1160 includes a secondprinted circuit board 1161 which is electrically connected to theprinted circuit board 1100 through a second signal transmitting line1162, and a second connector 1163 having a second neck 1165 installed onthe second printed circuit board 1161. The power and data terminals 1150and 1160 are separately installed in a case of the liquid crystaldisplay device 1000.

[0141] That is, the first connector 1153 receiving the driving powerfrom outside and the second connector 1163 receiving the image datasignal are separately installed on the first and second printed circuitboards 1151 and 1161, respectively. Such a separate installation isadvantageous as described below.

[0142]FIG. 26 is a perspective view for illustrating the case in whichthe liquid crystal display device is combined with the printed circuitboard and FIG. 27 is a plan view for showing the case in which theliquid crystal display device is combined with the printed circuitboard.

[0143] Referring to FIGS. 26 and 27, the case 1200 has a front case 1210including a bottom where an opening having a predetermined size isformed to expose the effective display area of the display unit 200, anda rear case 1220 combined with the front case 1210.

[0144] Also, the case 1200 has a supporting portion 1242 including afront supporting portion 1230 for receiving the power and the dataterminals 1150 and 1160, and a rear supporting portion 1240 that facesthe front supporting portion 1230 and is combined with the frontsupporting portion 1230. The front and rear supporting portions 1230 and1240 are respectively combined with the front and the rear cases 1210and 1220 by using hinges 1250 to move the liquid crystal display device1000 as shown in FIG. 26.

[0145] Openings having predetermined sizes are formed at the frontsupporting portion 1230 for receiving the first connector 1153 of thepower terminal 1150 and the second connector 1163 of the data terminal1160. Such openings are called as third and fourth receiving portions1231 and 1233 for receiving the first and the second connectors 1153 and1163, respectively.

[0146] As shown in FIG. 27, the third and fourth receiving portions 1231and 1233 are respectively wider than the first and second connectors1153 and 1163. Hence, the first and second connectors 1153 and 1163received in the third and fourth receiving portions 1231 and 1233 canmove in the left or the right direction, so that the liquid crystaldisplay device 1000 may be easily connected with an external informationprocessing device providing the driving power and the image data signalto the liquid crystal display device.

[0147] The assembled structure of the front supporting portion 1230, thepower terminal 1150 and the data terminal 1160 will be described indetail with reference to FIGS. 28 and 29.

[0148]FIG. 28 is a perspective view for showing the bottom structure ofthe front supporting portion shown in FIG. 27 and the structures of thepower and the data terminals combined with the front supporting portion,and FIG. 29 is a plan view for illustrating the operation states of thepower and the data terminals combined with the front supporting portionshown in FIG. 28.

[0149] Referring to FIG. 28, a first supporting stand 1232 forsupporting the first printed circuit board 1151 having the firstconnector 1153 which is received in the third receiving portion 1231, isformed on the bottom of the front supporting portion 1230 under thethird receiving portion 1231. A second supporting stand 1235 forsupporting the second printed circuit board 1161 where the data terminal1165 is installed, is formed on the front supporting portion 1230 underthe fourth receiving portion 1233.

[0150] Also, first and second stopper 1234 a and 1234 b are formedbetween the third receiving portion 1231 and the first supporting stand1232 to control the movement of the first connector 1153 received in thethird receiving portion 1231 in the left or the right direction. Inparticular, the first stopper 1234 a is positioned over one portion ofthe first supporting stand 1232 and is spaced apart from the upper faceof the first supporting stand 1232. The second stopper 1234 b ispositioned over the other portion of the first supporting stand 1232 andis spaced apart from the upper face of the first supporting stand 1232.The first and second stoppers 1234 a and 1234 b are sufficiently spacedapart from the upper face of the first supporting stand 1232 to receivethe first printed circuit board 1151. In addition, the interval betweenthe first stopper 1234 a and the second stopper 1234 b is larger thanthe width of the first neck 1155 of the first connector 1153.

[0151] Therefore, when the first connector 1153 is received in the thirdreceiving portion 1231 by supporting the first supporting stand 1232 asshown in FIG. 29, the interval of “L1” exists between the first neck1155 of the first connector 1153 and the first stopper 1234 a and theinterval of “L2” exists between the first neck 1155 of the firstconnector 1153 and the second stopper 1234 b. The rear supportingportion 1240 combined with the front supporting portion 1230 preventsthe power terminal 1150 from separating from the front supportingportion 1230.

[0152] Also, third and fourth stoppers 1236 a and 1236 b are formed by apredetermined interval between the fourth receiving portion 1233 and thesecond supporting stand 1235 to control the movement of the secondconnector 1163 received in the fourth receiving portion 1233 in the leftor the right direction. Particularly, the third stopper 1236 a ispositioned over one portion of the second supporting stand 1235 and isspaced apart from the upper face of the second supporting stand 1235.The fourth stopper 1236 b is positioned over the other portion of thesecond supporting stand 1235 and is spaced apart from the upper face ofthe second supporting stand 1235. The third and fourth stoppers 1236 aand 1236 b are sufficiently spaced apart from the upper face of thesecond supporting stand 1235 to receive the second printed circuit board1161. In addition, the interval between the third stopper 1236 a and thefourth stopper 1236 b is larger than the width of the second neck 1165of the second connector 1163.

[0153] Therefore, when the second connector 1163 is received in thefourth receiving portion 1233 by supporting the second supporting stand1235 as shown in FIG. 29, the interval of “L3” exists between the secondneck 1165 of the second connector 1163 and the third stopper 1236 a andthe interval of “L4” exists between the second neck 1165 of the secondconnector 1163 and the fourth stopper 1236 b. The rear supportingportion 1240 combined with the front supporting portion 1230 preventsthe data terminal 1160 from being separated from the front supportingportion 1230.

[0154] The liquid crystal display device assembled with an externalinformation processing device will be described with reference to FIGS.30 and 31.

[0155]FIG. 30 is a perspective view for illustrating the configurationof the external information processing device assembled with the liquidcrystal display device shown in FIG. 27, and FIG. 31 is a schematicperspective view for showing the operation state of the liquid crystaldisplay device assembled with the external information processing deviceshown in FIG. 31.

[0156] Referring to FIG. 30, a fifth receiving portion 1320 is formed onthe rear surface of the external information processing device 1300 forreceiving the front and rear supporting portions 1230 and 1240 of thecase 1200. The rear face of the external information processing device1300 is partially recessed to form the fifth receiving portion 1320.Also, a sixth receiving portion 1330 for receiving the front and rearcases 1210 and 1220 is extended from the fifth receiving portion 1320 tothe upper face of the external information processing device 1300.

[0157] Third and fourth connectors 1342 and 1344 are formed on thebottom of the fifth receiving portion 1320. The third and fourthconnectors 1342 and 1344 are connected to a power supplying and aninformation processing section installed in the external informationprocessing device 1300 to provide the driving power and the image datasignal to the first and second connectors 1153 and 1163.

[0158] In general, the third and fourth connectors 1342 and 1344 of theexternal information processing device 1300 are fixedly installed atspecific positions. Namely, the interval between the third connector1342 and the fourth connector 1344 is maintained at a predetermineddistance determined during the manufacture process of the externalinformation processing device 1300. Thus, when the first and secondconnectors 1153 and 1163 are fixedly installed at specific positions,the first and second connectors 1153 and 1163 may not be preciselyconnected to the third and fourth connectors 1342 and 1344 due to theminute processing errors which may occur during the manufacturingprocess of the external information processing device 1300 or the liquidcrystal display device 1000.

[0159] To prevent such a problem, when the liquid crystal display device1000 received in the case 1200 is combined with the external informationprocessing device 1300, the first and second connectors 1153 and 1163are movable in the left or the right direction so that the intervalbetween the first connector 1153 and the second connector 1163 ismaintained at a distance identical to the interval between the thirdconnector 1342 and the fourth connector 1344 as shown in FIG. 31.

[0160] When the supporting portion 1242 is inserted in the fifthreceiving portion 1320 so as to electrically connect the first andsecond connectors 1153 and 1163 with the third and fourth connectors1342 and 1344, the liquid crystal display device 1000 is electricallycoupled to the external information processing device 1300 as shown inFIG. 31.

[0161] The front and rear supporting portions 1230 and 1240 are combinedwith the front and rear cases 1210 and 1220 by the hinge 1250.Therefore, a user can utilize the liquid crystal display device 1000 inan upright position in a case where a certain information processing isperformed by means of the external information processing device 1300and the liquid crystal display device 1000. Also, the user can keep theliquid crystal display device 1000 received in the sixth receivingportion 1330 when the user does not use the liquid crystal displaydevice 1000.

[0162] According to the liquid crystal display device of the presentinvention described above, at least one boss is formed on the bottom ofa retainer for receiving the lamp generating the light and the lightguide plate, and the boss guides the lamp and the light guiding plate toproper positions, thereby preventing the movement and the collision ofthe lamp and the light guide plate. Also, the end portion of thereflection plate for reflecting the light under the light guide plate isextended to the upper face of the lamp, thereby enclosing the outside ofthe lamp. Therefore, the number of the parts installed in the liquidcrystal display device can be reduced, and the manufacturing cost can bedecreased because the manufacturing process is simplified in comparisonwith the liquid crystal display device including a separate lamp cover.

[0163] Also, the transformer providing the driving power to the lamp andthe liquid crystal display panel is received in the opening formed inthe printed circuit board installed on the rear face of the retainer bya predetermined depth. Hence, the overall thickness of the liquidcrystal display device can be reduced as much as the depth that thetransformer is inserted into the opening.

[0164] Furthermore, the first and second connectors are respectivelyinstalled on the first and second printed circuit boards separated fromthe printed circuit board. The first and second connectors provide theimage data signal and the driving power from outside to the power supplyportion and signal converting portion formed on the printed circuitboard. In addition, the first and second openings for receiving thefirst and second connectors have the sizes in which the first and secondconnectors can move toward each other or be spaced apart from eachother. Thus, the interval between the first connector and the secondconnector can be adjusted according to the interval between theconnectors installed on the external information processing device,thereby easily accomplishing the electrical connection between theliquid crystal display device and the external information processingdevice.

[0165] Although the exemplary embodiments of the present invention havebeen described, it is understood that the present invention should notbe limited to these embodiments but various changes and modificationscan be made by one skilled in the art within the spirit and scope of thepresent invention as hereinafter claimed.

What is claimed is:
 1. A liquid crystal display device comprising: alight generating means for generating a light; a light guiding means forguiding the light to a display means for displaying an image; areflecting means disposed under said light guiding means, for reflectingthe light toward said light guiding means; and a receiving means forreceiving said reflecting means, said light guiding means and said lightgenerating means, wherein said receiving means comprises at least oneboss at a bottom surface thereof, said at least one boss guiding aposition of said light generating means and preventing said lightgenerating means from being moved.
 2. The liquid crystal display deviceof claim 1, wherein said receiving means comprises a first receivingcontainer having a side wall and a bottom, said bottom comprising anopening to expose a rear surface of said reflecting means; and a secondreceiving container being combined with said first receiving containerfor preventing said reflecting means, said light guiding means and saidlight generating means from separating from said first receivingcontainer.
 3. The liquid crystal display device of claim 2, wherein saidbottom of said first receiving container comprises said at least oneboss at at least one corner portion thereof, said at least one bossbeing spaced from said side wall of said first receiving container. 4.The liquid crystal display device of claim 3, wherein said boss isformed at four corner portions of the bottom of said first receivingcontainer.
 5. The liquid crystal display device of claim 2, wherein saidreflecting means comprises a reflecting body portion, and a reflectionportion extended from an end of said reflecting body portion with apredetermined length, and enclosing an outer face of said lightgenerating means.
 6. The liquid crystal display device of claim 1,wherein said reflecting means comprises a reflecting body portion, afirst reflecting member extended from an end of said reflecting bodyportion and a second reflecting member extended from an end of saidfirst reflecting member, said second reflecting member covering an upperportion of said light generating means.
 7. The liquid crystal displaydevice of claim 5, wherein said reflecting means comprises at least onefirst hole corresponding to said at least one boss on the bottom of saidfirst receiving container, and said at least one first hole beingcombined with said at least one boss, guiding said reflecting means to areceiving position in said first receiving container.
 8. The liquidcrystal display device of claim 5, wherein said light generating meansincludes a lamp having a bending portion.
 9. The liquid crystal displaydevice of claim 8, wherein the lamp is received between said at leastone boss and said side wall of said first receiving container.
 10. Theliquid crystal display device of claim 8, wherein said reflectionportion is extended from at least two adjacent ends of said reflectingbody portion an upper face of said bending portion of said lamp beingcovered with an overlapped portion of said reflection portion.
 11. Theliquid crystal display device of claim 10, wherein said bending portionof said lamp comprises first and second bending portions and saidreflection portion comprises first, second and third reflection portionsextended from first, second and third ends of said reflecting bodyportion, respectively, and each of upper faces of said first and secondbending portions being covered with overlapped portions of said firstand second reflection portions and said second and third reflectionportions, respectively.
 12. The liquid crystal display device of claim11, wherein a first end portion of said first reflection portioncovering said first bending portion is extended longer than a first endportion of said second reflection portion.
 13. The liquid crystaldisplay device of claim 11, wherein a second end portion of the thirdreflection portion covering the second bending portion is extendedlonger than a second end portion of the second reflection portion. 14.The liquid crystal display device of claim 8, wherein said bottom ofsaid receiving means comprises a vent opening to discharge a heatgenerated from the lamp.
 15. The liquid crystal display device of claim2, further comprising a light controlling meanson said light guidingmeans, for controlling a brightness of the light emitted from said lightguiding means.
 16. The liquid crystal display device of claim 15,wherein said light controlling means comprises at least one diffusionsheet for enlarging a visual angle of the light emitted from said lightguiding means.
 17. The liquid crystal display device of claim 15,wherein said first receiving container comprises an isolation wall, saidwall comprising at least one protuberance to guide a receiving positionof said light controlling means.
 18. The liquid crystal display deviceof claim 17, wherein said light controlling means comprises at least oneprotruding portion, said at least one protruding portion being partiallyextended from one end of said light controlling means and including asecond hole, said hole being combined with said at least oneprotuberance of said first receiving container, preventing said lightcontrolling means from being moved within said receiving means.
 19. Theliquid crystal display device of claim 15, wherein said second receivingcontainer has a bottom including an opening for guiding the lightemitted from said light controlling means to said display means, and aborder defining said opening, said border having a width to cover saidat least one boss of said first receiving container.
 20. The liquidcrystal display device of claim 2, further comprising a top chassis,wherein said top chassis is combined with said first receivingcontainer, for fixing said display means to said second receivingcontainer, and said top chassis includes a bottom having an openingcorresponding to an effective display area of said display means. 21.The liquid crystal display device of claim 20, further comprising aprinted circuit board, wherein said printed circuit board is combinedwith a rear surface of said first receiving container, for controllingoperations of said light generating means and said display means. 22.The liquid crystal display device of claim 21, wherein said top chassiscomprises a combining portion partially extended from a side wall ofsaid top chassis, and the combining portion is combined with a groundterminal of said printed circuit board.
 23. The liquid crystal displaydevice of claim 2, wherein said light generating means comprises a powersupply line connected at opposite ends of said light generating means,for receiving a driving power.
 24. The liquid crystal display device ofclaim 23, wherein said bottom of said first receiving containercomprises an isolation wall spaced from said side wall of said firstreceiving container, and said power supply line is guided through aspace between said isolation wall and said side wall of said firstreceiving container.
 25. The liquid crystal display device of claim 24,further comprising a light controlling means on said light guidingmeans, for controlling the light emitted from said light guiding meansto provide said display means with a controlled light.
 26. The liquidcrystal display device of claim 25, wherein said isolation wallcomprises an upper surface including at least one protuberance to guidesaid light controlling means to a receiving position.
 27. The liquidcrystal display device of claim 26, wherein said at least oneprotuberance is protruded from said isolation wall toward said side wallof said first receiving container, for preventing said power supply linereceived between said isolation and side walls from being released. 28.The liquid crystal display device of claim 26, wherein said lightcontrolling means comprises a plurality of protruding portions at oneend thereof, each of said plurality of protruding portions having asecond hole and being combined with each of the plurality ofprotuberances, preventing said light controlling means from being movedwithin said receiving means.
 29. A liquid crystal display devicecomprising: a display means for displaying an image; a receiving meansfor receiving said display means; a power supplying means for providinga driving power to said display means; and a printed circuit boardhaving an opening into which said power supplying means is inserted andreceived.
 30. The liquid crystal display device of claim 29, whereinsaid power supplying means is disposed at a back of said receivingmeans.
 31. The liquid crystal display device of claim 30, wherein saidpower supplying means is a transformer for converting a power fromoutside into the driving power which is to be provided to said displaymeans.
 32. A liquid crystal display device comprising: a display meansfor displaying an image; a receiving means for receiving said displaymeans; a first printed circuit board disposed at a back of saidreceiving means, said first printed circuit board having a powersupplying means for providing a driving power to said display means anda signal converting means for converting a signal which is to beprovided to said display means; a first connector installed on a secondprinted circuit board separated from said first printed circuit board,said first connector being connected to said power supplying meansthrough a power supplying line for providing a power inputted fromoutside to said power supplying means; a second connector installed on athird printed circuit board separated from said first and said secondprinted circuit boards, said second connector being connected to saidsignal converting means through a data transmitting line for providing adata signal inputted from outside to said signal converting means; afront case; and a rear case combined with said front case to receivesaid display means, wherein said front and rear cases respectivelycomprise:first and second openings for receiving said second and thirdprinted circuit boards, respectively, and for exposing said first andsaid second connectors to be movable within said first and secondopenings.
 33. The liquid crystal display device of claim 32, whereinsaid first printed circuit board includes a third opening in which saidpower supplying means is inserted and received.
 34. The liquid crystaldisplay device of claim 33, wherein said power supplying means is atransformer for converting a power from outside into the driving powerwhich is to be provided to said display means.
 35. A liquid crystaldisplay device comprising: a light generating means for generating alight; a light guiding means for guiding the light to a display meansfor displaying an image; a reflecting means installed under said lightguiding means, for reflecting the light toward said light guiding means;and a receiving means for receiving said reflecting means, said lightguiding means and said light generating means, wherein said reflectingmeans comprises a reflecting body portion, and a reflection portion,said reflection portion being extended from an end of said reflectingbody portion with a predetermined length, and enclosing an outside ofsaid light generating means.
 36. The liquid crystal display device ofclaim 35, wherein said reflecting means comprises a first reflectingmember extended from an end of said reflecting body portion and a secondreflecting member extended from an end of said first reflecting member,said second reflecting member covering an upper portion of said lightgenerating means.
 37. The liquid crystal display device of claim 35,wherein said receiving means comprises: a first receiving containerhaving a side wall and a bottom, said bottom comprising an opening toexpose a rear surface of said reflecting means; and a second receivingcontainer, being combined with said first receiving container, forpreventing said reflecting means, said light guiding means and saidlight generating means from being separated from said first receivingcontainer.
 38. The liquid crystal display device of claim 37, whereinsaid bottom of said first receiving container comprises bosses at cornerportions of the bottom, the bosses being spaced from the side wall ofsaid first receiving container.
 39. The liquid crystal display device ofclaim 38, wherein said reflecting means comprises at least one holecorresponding to the bosses, said at least one hole being combined withsaid bosses, guiding said reflecting means to a receiving position. 40.The liquid crystal display device of claim 39, wherein said lightgenerating means is an integral lamp having a bending portion and isreceived between the bosses and the side wall of said first receivingcontainer.
 41. The liquid crystal display device of claim 40, whereinsaid reflection portion is extended from at least two adjacent ends ofsaid reflecting body portion, an upper face of said bending portion ofthe lamp being covered with an overlapped portion of said reflectionportion.
 42. The liquid crystal display device of claim 41, wherein saidbending portion of said lamp comprises first and second bending portionsand said reflection portion comprises first, second and third reflectionportions extended from first, second and third ends of said reflectingbody portion, each of upper surfaces of said first and second bendingportions being covered with an overlapped portion of said first andsecond reflection portions and said second and third reflectionportions, respectively.
 43. The liquid crystal display device of claim42, wherein a first end portion of the first reflection portion coveringthe first bending portion is extended longer than a first end portion ofthe second reflection portion.
 44. The liquid crystal display device ofclaim 42, wherein a second end portion of the third reflection portioncovering the second bending portion is extended longer than a second endportion of the second reflection portion.